China’s sport stars Yao Ming and Liu Xiang _____ Goodwill Ambassadors（亲善大使） for Shanghai.
| A．has been named | B．have been named |
| C．has named | D．have named |
China’s sport stars Yao Ming and Liu Xiang _____ Goodwill Ambassadors（亲善大使） for Shanghai.
| A．has been named | B．have been named |
| C．has named | D．have named |
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